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1

Thermal influence on structure of polymers with ε-caprolactam units studied by FT-IR spectroscopy

Rusu E., Rusu G., Dorohoi D.-O.

Polimery

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2009

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T. 54, nr 5

347-353

EN

Some films obtained from poly(ε-caprolactam) (polyamide 6) and its copolymers with laurolactam (copolyamides 6/12) were submitted to thermal treatment. The most versatile method for characterization of polyamide and its copolymers, i.e., FT-IR spectroscopy, was chosen as a tool in order to determine the possible changes in the structures of polymers. It was observed that the polymers films showed Brill transition during heating.

PL

Zsyntetyzowano poli(kaprolaktam) (poliamid 6) i jego kopolimery z laurolaktamem (kopoliamid 6/12) stosując do 50 % mas. laurolaktamu (CLL0, CLL5, CLL10, CLL20 i CLL30). Przygotowane z tych polimerów folie o grubości 40žm poddano działaniu temperatury w zakresie od 20 do 180 st. w czasie 30min. Następnie próbki charakteryzowano za pomocą jednowymiarowej i dwuwymiarowej spektroskopii FT-IR (rys. 1-7). Zaobserwowano, że przemiana fazowa kryształ-kryształ tzw. przemiana Brill'a zachodzi w przypadku poliamidu 6 w temp. 160 st. a w przypadkach kopoliamidów 6/12 w temp. 120°.

2

Zielone metody wytwarzania półproduktów do syntezy polimerów

Pińkowska H.

Przemysł Chemiczny

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2006

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T. 85, nr 4

242-248

PL

Dokonano przeglądu literatury w zakresie osiągnięć zielonej chemii, w części dotyczącej metod wytwarzania półproduktów do syntezy polimerów. Zaprezentowano przyjazne dla środowiska metody otrzymywania monomerów z surowców petrochemicznych i metody polegające na zastępowaniu reagentów pochodzenia petrochemicznego, reagentami pozyskiwanymi ze źródeł odnawialnych.

EN

A review with 141 refs. covering syntheses of adipic acid, ε-caprolactam, terephthalic acid, methyl methacrylate, maleic anhydride, acrylates, 1,3-propanediol, lactic acid, and dicarboxylic acids, no-phosgene syntheses of isocyanates and polycarbonates, and processing of renewable biomass (e.g. to EtOH).

3

Adhesion and growth of human osteoblast-like cells on aliphatic polyesters with different chemical composition, surface roughness and modification with hydroxyapatite

Vagaska B., Bacakova L., Pamuła E., Lisa V., Dobrzyński P.

Inżynieria Biomateriałów

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2006

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R. 9, nr 58-60

4-7

EN

In this study we have investigated the effect of three groups of polymeric foils on the behavior of MG 63 osteoblast-like cells. These included (1) poly(L-lactide) (PLLA) compared with newly synthesized copolymer of L-lactide and trimethylene carbonate (PLTMC 50:50), (2) three samples made of glycolide and epsylon-caprolactone copolymer (PGCap) with different surface roughness and topography, and finally (3) copolymer of glycolide with L-lactide (PGLA) compared with its modification with hyroxyapatite deposits. On the 1st and 4th day of cultivation the cell number on all of the samples was lower than on control polystyrene culture dish. However, on day 8 after seeding, the values on the tested samples caught up with the control polystyrene. In the first group the cell number of PLTMC was higher than on polystyrene or PLLA. In the second group, the number of cells on PGCap samples of the lower surface roughness (RRMS 130 and 180 nm) was significantly higher than that on the control polystyrene, whereas on the PGCap samples with the rounghness in micrometers, it was comparable to the value on the polystyrene. Moreover, the surface roughness influenced the cell adhesion area. The cells on the sample with the highest roughness index were roundly shaped and their adhesion area was significantly lower, because the cells were restricted in their spreading by the surface structure of the material. In the last group, the number of cells on day 8 on the polymer with hydroxyapatite deposits was significantly higher than on standard tissue culture polystyrene dish, as well as on unmodified PGLA foil, which suggested that hydroxyapatite supports cell proliferation.

4

Modification of PA 6 by Comonomers and Layered Silicate

Krištofič M., Karabcová N., Alexy P., Ryba J., Vassová I.

Fibres & Textiles in Eastern Europe

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2005

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Vol. 13, no. 6 (54)

33--35

EN

This paper deals with the synthesis of modifiers consisting of co-polyamide with clay prepared from co-monomers, namely from ε-caprolactam (CL) and nylon salt (NS) from adipic acid + diethylenetriamine (ADETA), and montmorillonite (MMT). We present a procedure for evaluating the modifiers’ properties, such as the amount of low molecular compounds (LMC) and the relative viscosity (ηr = ηs/η0) performed in accordance with principles of the five-level two-factor experimental design. Four selected samples were synthesised and their properties were checked.

PL

Artykuł omawia syntezę modyfikatorów, składających się z kopoliamidów z glikolami preparowanymi z komonomerów, takimi jak ε-kaprolaktam, sól nylonowa otrzymana z kwasu adypinowego z dwuetylenotriaminy oraz montmorylonitu. Przedstawiono procedury oceny właściwości modyfikatora, takich jak ilość nisko-molekularnych składników i lepkość względna (ηr = ηs/η0), przygotowanych zgodnie z zasadami pięciopoziomowego, dwuczynnikowego planu eksperymentu. Cztery wyselekcjonowane próbki poddano syntezie, a następnie określono ich właściwości.